Merge pull request #28 from YanserLiu/master

更新README.md文件,Get单条数据时，指定表名

README.md

@@ -1053,16 +1053,16 @@ has, err := engine.Get(&user)
 has, err := engine.Where("name = ?", name).Desc("id").Get(&user)
 // SELECT * FROM user WHERE name = ? ORDER BY id DESC LIMIT 1
 var name string
-has, err := engine.Where("id = ?", id).Cols("name").Get(&name)
+has, err := engine.Table(&user).Where("id = ?", id).Cols("name").Get(&name)
 // SELECT name FROM user WHERE id = ?
 var id int64
-has, err := engine.Where("name = ?", name).Cols("id").Get(&id)
+has, err := engine.Table(&user).Where("name = ?", name).Cols("id").Get(&id)
 // SELECT id FROM user WHERE name = ?
 var valuesMap = make(map[string]string)
-has, err := engine.Where("id = ?", id).Get(&valuesMap)
+has, err := engine.Table(&user).Where("id = ?", id).Get(&valuesMap)
 // SELECT * FROM user WHERE id = ?
 var valuesSlice = make([]interface{}, len(cols))
-has, err := engine.Where("id = ?", id).Cols(cols...).Get(&valuesSlice)
+has, err := engine.Table(&user).Where("id = ?", id).Cols(cols...).Get(&valuesSlice)
 // SELECT col1, col2, col3 FROM user WHERE id = ?
 ```